Bu sayede modeli **birden fazla yerde yeniden kullanabilir**, ayrıca tüm parametreler için doğrulamaları ve metadata bilgilerini tek seferde tanımlayabilirsiniz. 😎

/// note | Not

Bu özellik FastAPI `0.115.0` sürümünden beri desteklenmektedir. 🤓

///

## Pydantic Model ile Header Parametreleri { #header-parameters-with-a-pydantic-model }

# Input ve Output için Ayrı OpenAPI Schema'ları (Ya da Değil) { #separate-openapi-schemas-for-input-and-output-or-not }

**Pydantic v2** yayınlandığından beri, üretilen OpenAPI eskisine göre biraz daha net ve **doğru**. 😎

Hatta bazı durumlarda, aynı Pydantic model için OpenAPI içinde input ve output tarafında, **default değerler** olup olmamasına bağlı olarak **iki farklı JSON Schema** bile görebilirsiniz.

	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
	github.com/fatih/structs v1.1.0 // indirect
	github.com/felixge/httpsnoop v1.0.4 // indirect
	github.com/go-asn1-ber/asn1-ber v1.5.8-0.20250403174932-29230038a667 // indirect
	github.com/go-ini/ini v1.67.0 // indirect
	github.com/go-jose/go-jose/v4 v4.1.0 // indirect
	github.com/go-logr/logr v1.4.2 // indirect

 * multiple variants of ASN.1, including:
 *
 *  * DER: Distinguished Encoding Rules. This further constrains ASN.1 for deterministic encoding.
 *  * BER: Basic Encoding Rules.
 *
 * This class was implemented according to the [X.690 spec][[x690]], and under the advice of
 * [Lets Encrypt's ASN.1 and DER][asn1_and_der] guide.
 *
 * [x690]: https://www.itu.int/rec/T-REC-X.690

began again:  `Ou est ma chatte?' which was the first sentence in
her French lesson-book.  The Mouse gave a sudden leap out of the
water, and seemed to quiver all over with fright.  `Oh, I beg
your pardon!' cried Alice hastily, afraid that she had hurt the
poor animal's feelings.  `I quite forgot you didn't like cats.'

  `Not like cats!' cried the Mouse, in a shrill, passionate

        },
        "basque_stop": {
          "type":       "stop",

        },
        "basque_stop": {
          "type":       "stop",

github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/go-asn1-ber/asn1-ber v1.5.8-0.20250403174932-29230038a667 h1:BP4M0CvQ4S3TGls2FvczZtj5Re/2ZzkV9VwqPHH/3Bo=
github.com/go-asn1-ber/asn1-ber v1.5.8-0.20250403174932-29230038a667/go.mod h1:hEBeB/ic+5LoWskz+yKT7vGhhPYkProFKoKdwZRWMe0=
github.com/go-ini/ini v1.67.0 h1:z6ZrTEZqSWOTyH2FlglNbNgARyHG8oLW9gMELqKr06A=

began again:  `Ou est ma chatte?' which was the first sentence in
her French lesson-book.  The Mouse gave a sudden leap out of the
water, and seemed to quiver all over with fright.  `Oh, I beg
your pardon!' cried Alice hastily, afraid that she had hurt the
poor animal's feelings.  `I quite forgot you didn't like cats.'

  `Not like cats!' cried the Mouse, in a shrill, passionate

Docker ve benzeri araçlar image build ederken ayrıca bir **internal cache** kullanır. Son build'den beri bir dosya değişmediyse, dosyayı tekrar kopyalayıp sıfırdan yeni bir layer oluşturmak yerine, daha önce oluşturulan **aynı layer**'ı yeniden kullanır.